feat: add LeastCodeSequencer with nearest-neighbor and 2-opt

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

OpenNest.Engine/Sequencing/PlateHelper.cs

@@ -0,0 +1,22 @@
+using OpenNest.Geometry;
+
+namespace OpenNest.Engine.Sequencing
+{
+    internal static class PlateHelper
+    {
+        public static Vector GetExitPoint(Plate plate)
+        {
+            var w = plate.Size.Width;
+            var l = plate.Size.Length;
+
+            return plate.Quadrant switch
+            {
+                1 => new Vector(w, l),
+                2 => new Vector(0, l),
+                3 => new Vector(0, 0),
+                4 => new Vector(w, 0),
+                _ => new Vector(w, l)
+            };
+        }
+    }
+}